332 BOTANY. 



Among rocks at high elevations on Lassen's Peak, Mt. Shasta ( and Pyramid Peak, and at 

 other high points in tho Sierras of California, Brewer, Lemmon. Cascade Mts. of British Columbia, 

 Dr. Lyall. A Fern growing in large and dense patches, and much resembling narrow, delicate forms of 

 the Lady Fern, but with globose sori near the margin of the lobes of the pinnce, and without special 

 proper indusium, for the objects figured as indusia by Mettenius in his later work on Asplenium are too 

 delicate and fugitive to deserve the name. A common species in Northern Europe, but there the plant 

 has usually broader segments than are found in the American specimens. The Eastern species, P. poly- 

 podioides and P. hexagonoptera, do not, to my knowledge, occur in the Southwest or in the Pacific States. 

 P. Dryopteris, however, has been collected in Oregon. 



xm. ASPIDIUM. Swartz. 

 § 1. DRYOPTERIS or NEPHRODIUM. 



Indusium round-reniform, or orbicular with a narrow sinus. 

 * Texture thin-memlranaceous, veins simple or once forked. 



Aspidium Nevadense, (n. sp.). 



Rootstock creeping, densely covered with the persistent bases of former 

 stalks; fronds standing in a crown, thin-membranaceous, 1^—3 feet high, 

 lanceolate in outline, pinnate ; pinnae linear-lanceolate from a broad base, 

 deeply pinnatifid ; the lower pairs distant and gradually reduced to mere 

 auricles ; lobes crowded, oblong, entire or sparingly toothed, slightly hairy 

 on the veins beneath, and sprinkled with minute resinous particles ; veins 

 about seven pairs to a lobe, simple or forking ; sori close to the margin ; 

 indusium minute, reniform, furnished with a few dark-colored marginal 

 glands, and bearing several long straight jointed hairs on the upper surface. 



Moist and shady places along creeks. Butte Co., California (Mrs. Pulsi/er Ames), and in similar 

 places in Plumas Co., Mrs. B. M. Austin and Mrs. Ames. The first specimens received were referred 

 to A. Noveboracense, to which species there is the closest resemblance in the size, shape, and texture of 

 the fronds, but lattr and more complete specimens hava a rootstock of a very different character. The 

 Central American A. contermimim is more like the present species in some of its characters, but that has 

 much firmer fronds and an erect rootstock. Aspidium Nevademse of Boissitr (a Spanish Fern) having been 

 proved to be identical with A. rigidum, var. pallidum, there is no reason why the name should not be 

 taken for a Fern coming from the Sierra Nevada of California. 



Aspidium patens, Swartz. 



Rootstock rather stout, creeping, bearing several fronds at the growing 

 end ; fronds 1-3 feet high, moderately long-stalked, ovate-oblong in out- 

 line, membranaceous, softly pubescent beneath, pinnate; pinnse closely 

 placed, linear-acuminate, 3-6 inches long, 5-7 lines wide, the lowest 

 pair scarcely or not at all smaller, but somewhat deflexed, all pinnately 

 incised three-fourths of the way to the midrib ; segments very numerous, 



